US5124869A - Matrix device with magnetic heads, notably in thin layers - Google Patents

Matrix device with magnetic heads, notably in thin layers Download PDF

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Publication number
US5124869A
US5124869A US07/342,012 US34201289A US5124869A US 5124869 A US5124869 A US 5124869A US 34201289 A US34201289 A US 34201289A US 5124869 A US5124869 A US 5124869A
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United States
Prior art keywords
magnetic
heads
head
information
intensity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US07/342,012
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English (en)
Inventor
Jean-Claude Lehureau
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Thales SA
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Thomson CSF SA
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Publication of US5124869A publication Critical patent/US5124869A/en
Assigned to THALES reassignment THALES CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: THOMSON-CSF
Assigned to THALES reassignment THALES CORPORATE ADDRESS CHANGE Assignors: THALES
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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/49—Fixed mounting or arrangements, e.g. one head per track
    • G11B5/4969—Details for track selection or addressing
    • G11B5/4976—Disposition of heads, e.g. matrix arrangement
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B15/12—Masking of heads; circuits for Selecting or switching of heads between operative and inoperative functions or between different operative functions or for selection between operative heads; Masking of beams, e.g. of light beams
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
    • G11B5/3176—Structure of heads comprising at least in the transducing gap regions two magnetic thin films disposed respectively at both sides of the gaps
    • G11B5/3179—Structure of heads comprising at least in the transducing gap regions two magnetic thin films disposed respectively at both sides of the gaps the films being mainly disposed in parallel planes
    • G11B5/3183—Structure of heads comprising at least in the transducing gap regions two magnetic thin films disposed respectively at both sides of the gaps the films being mainly disposed in parallel planes intersecting the gap plane, e.g. "horizontal head structure"
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/488—Disposition of heads
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/49—Fixed mounting or arrangements, e.g. one head per track
    • G11B5/4969—Details for track selection or addressing
    • G11B5/4984—Structure of specially adapted switching heads
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/49—Fixed mounting or arrangements, e.g. one head per track
    • G11B5/4969—Details for track selection or addressing
    • G11B5/4992—Circuits

Definitions

  • the invention relates to a magnetic recording device with several heads, notably in thin layers.
  • a magnetic head consists of a magnetic circuit with a gap, associated with a coil to which is applied the signal to be recorded on the medium placed in the vicinity of the gap. This signal applied to the coil creates a magnetic field used to magnetize the small zone of the medium which is in the vicinity of the gap.
  • the invention enables a particularly simple structure of a set of magnetic recording heads.
  • the device of the invention comprises a matrix network of magnetic heads, wherein the signals to be recorded are provided to each head by simple electrical conducting wires, preferably uncoiled, placed along the same matrix network, each head being thus associated with two wires of different directions.
  • the network is plane and the wires are rectilinear.
  • each magnetic head there are two corresponding conductive wires, one row wire and one column wire.
  • the sum of the intensities of the currents flowing through each of the wires should exceed a predetermined value.
  • the intensity of the current in each conductor of a head recording an item of information has a first value, while the heads that record no information are associated with at least one conductor through which there flows a current having an intensity of a second value, which is smaller in terms of absolute value than the first one.
  • an item of information is recorded solely by the magnetic heads to which correspond the row and column wires that are simultaneously crossed by a current of sufficient intensity.
  • the magnetic heads are of the type having thin layers deposited on a substrate so that the magnetic field created is parallel to the surface of the substrate, the gap forming a layer perpendicular to this surface.
  • a method which consists in firstly depositing a first pole on the substrate and then depositing the material forming the gap. This second layer has a smaller thickness than the first one and covers an end section of the first layer. Then, at least on the gap layer, a third layer of a magnetic material, forming the second pole, is deposited. Finally, these thin layers are polished or cleaned so as to bare the gap. With a method of his type, it is possible to obtain a gap of very small thickness.
  • the thin layers are deposited directly on the magnetic substrate which is preferably in the form of a plate or "wafer".
  • This magnetic substrate has, for example, grooves in which the row and column wires are arranged.
  • FIG. 1 is a drawing showing the various parts of a device with magnetic heads according to the invention
  • FIG. 2 is a section, along the line 2--2 of FIG. 1;
  • FIGS. 3 a to 3 d are drawings showing a method of making a magnetic head of the device of FIG. 1;
  • FIG. 4 is a drawing showing the working of the device of FIG. 1;
  • FIG. 4 a corresponds to a variant of FIG. 4;
  • FIG. 5 is a drawing of a variant of a device of FIG. 1;
  • FIG. 6 is a drawing showing the use of the device of FIG. 1 or FIG. 5.
  • the device with magnetic heads M 1 , M 2 . . . shown in FIGS. 1 and 2, comprises a wafer 10 made of magnetic material such as a ferrite with rectilinear grooves 11 1 , 11 2 , 11 3 . . . , 12 1 , 12 2 , 12 3 . . . on one of its faces 13.
  • the grooves 11 1 , 11 2 , 11 3 . . . are parallel to each other and form rows while the grooves 12 1 , 12 2 , 12 3 . . . are perpendicular to the rows and form columns.
  • each groove there is an electrical conductor 14 1 , 14 2 , 14 3 . . . , 15 1 , 15 2 , 15 3 . . .
  • the conductor 14 1 is placed in the groove 11 1
  • the conductor 14 2 is placed in the groove 11 2
  • the conductor 15 1 is in the groove 12 1 etc.
  • each gap 19 is beneath the intersection of a row conductor and a column conductor.
  • the gap 19 covers the intersection of the conductors 14 1 and 15 1 .
  • each pole piece 17, 18, covers a pad or "block" 17', 18' of the plate 10.
  • block refers to a raised element on the surface 18 which is demarcated by grooves. It is also specified that the conductors 14 and 15 are not secants but that the term “intersection” refers to the point of each of these conductors having a same projection on the plane of the wafer 10.
  • the pole pieces 17 and 18 and, hence, the blocks 17' and 18' are on either side of the conductor 14 1 (or of the groove 11 1 ) as well as on either side of the conductor 15 1 (or of the groove 12 1 ).
  • the pole pieces 17 and 18 have a part 17 2 , 18 2 with a greater square-shaped area or rectangular area corresponding to the block 17', 18' as well as an extension 17 1 , 18 1 of one of the corners of the rectangle in the vicinity of the intersection of the conductors 14 1 and 15 1 .
  • the gap 19 is between these extensions 17 1 and 18 1 .
  • the general direction of these extensions corresponds to a diagonal, i.e. about 45° with respect to the rows and the columns.
  • the general direction of the slot of the gap 19 is, for example, parallel to the conductors 14 1 .
  • gaps are inclined by a small angle with reference to this direction whereas other gaps in staggered formation are inclined in reverse direction. In this way, the items of information recorded on the neighbouring tracks can be distinguished by the inclination of the magnetization, thus reducing the risk of diaphony during the reading.
  • FIGS. 3 a , 3 b , 3 c and 3 d are followed.
  • the pole piece 17 is formed on the non-magnetic plate 16.
  • the flank 20 perpendicular to the surface 16 1 forms the end of the part 17 1 of this piece 17, i.e. one of the faces of the gap.
  • the piece 17 is deposited, for example, by photo-etching.
  • a non-magnetic layer 21 is deposited.
  • the thickness of this layer 21 is smaller than that of the layer 17, and it covers both the surface 16 1 of the wafer 16 and the layer 17 as well as its flank 20.
  • the magnetic circuit of each head is closed by the ferrite wafer 10.
  • these grooves are filled with a resin or with another meltable or thermosetting material, and then the face thus formed is polished and the pole pieces 17, 18, and the gap 19 are directly deposited on this polished face at the locations of the blocks 17', 18'.
  • This deposition may be done, for example, by the method described above with reference to FIGS. 3 a to 3 d .
  • the magnetic head device thus described can be used to record a series of items of information of a digital type on a magnetic medium, for example, a tape.
  • a piece of binary information of 1 (or of 0) is recorded on the tape either by a magnetization with a determined direction and a value exceeding a threshold or by the transitiion between two magnetizations of opposite directions and of values greater than a threshold.
  • a current with an intensity I is injected into the order n row conductor and the order m column conductor.
  • currents of an intensity -I/3 are injected.
  • the intensity I creates a magnetic field of a value which is insufficient to record the binary digit on the tape.
  • the magnetic fields created by the two conductors through which a current I flows generate a magnetic field which is sufficient to record a binary digit.
  • the field created by the current with an intensity -I/3 on the non-addressed rows and columns reduces the unwanted fields.
  • a point normally not addressed which corresponds to a row (or column) conductor crossed by a current I and a column (or row) conductor crossed by a current -I/3
  • the necessarily created unwanted field is thus reduced.
  • FIG. 4 there are five row wires, 14 1 to 14 5 , and six column wires, 15 1 to 15 6 , available, giving thirty magnetic heads in all.
  • the rows 14 1 , 14 3 and 14 4 and the column 15 4 are addressed, i.e. these conductors are crossed by a current with an intensity I while the others are crossed by a current with an intensity -I/3.
  • three points are recorded: those at the intersection of the column 15 4 and the rows 14 1 , 14 3 and 14 4 .
  • two current pulses of opposite directions are successively applied to each row, firstly a positive pulse with an intensity 2I 1 /3 and then a negative pulse with an intensity -2I 1 /3.
  • constant intensities I 1 /3 are applied if it is sought to record a binary digit "1" or -I 1 /3 if it is sought to record a binary "0".
  • the magnetization corresponds to a current of an intensity I 1 /3 which is insufficient to record or erase an item of information.
  • the magnetization is equivalent to that produced by a current -I 1 , which enables the recording of a "0".
  • the sum of the row and the column currents is sufficient to record an item of information.
  • the sum of the currents is not enough to record or erase an item of information.
  • the device with magnetic heads also has the general shape of a rectangle. However, it differs from the one shown in FIG. 1 by the fact that the pole pieces of a head are not diagonally oriented but are in the direction of a side 30 of the rectangle.
  • pole pieces form simple strips extended in a direction parallel to the side 30.
  • the pole pieces for example those referenced 31 in FIG. 5, which are not at the ends (near the edges 32 and 33 perpendicular to the edge 30) are common to two magnetic heads. It is seen, in particular, that the pole piece 31 is bordered by two gaps 34 and 35.
  • the grooves which reach the signal recording conductors are diagonally oriented.
  • each conductor has two parts in series.
  • the conductor 36 2 has a first rectilinear part associated with the gap 37 on the second row, and with the gap 34 on the first row, as well as a second part 36 2 ', in series with the first part, associated with gaps 38, 39 and 40 on the third, fourth and fifth rows.
  • Only one diagonal conductor 36 5 has only one part. All the row conductors (in two parts or in only one part) encounter the same number of heads.
  • the embodiment is the same as in the case of FIG. 1.
  • FIG. 6 shows a device with magnetic heads of the type decribed with reference to FIG. 1 or FIG. 5, simultaneously recording on a number of tracks 51, 52, etc. on a magnetic tape, this number of tracks being equal to the number of magnetic heads in the device 48.
  • the spacing between the tracks can be constant, the gaps of the different heads on one and the same row are separated by a constant distance, and the projection, on the direction 53, crosswise to the tape 50, of the distance between the last gap 54 of a row and the first gap 55 of the following row is equal to the projection, on this same direction 53, of the distance between two neighbouring gaps on one and the same row.
  • a particularly appropriate device is, for example, the one described in the French patent No. 84 08252 wherein there is provision for a light source such as a laser, a magneto-optic transducer, comprising a layer of a ferrimagnetic material, magnetized by the tape when it comes near this material, and a reflecting layer on this material in the vicinity of the tape.
  • the light beam goes through the ferrimagnetic material which is reflected by the reflecting layer. In this way, the direction of polarization of the beam is rotated in one direction, depending on the magnetization of the zone observed, and reflection enables the angular rotation to be doubled.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Magnetic Heads (AREA)
US07/342,012 1988-04-27 1989-04-24 Matrix device with magnetic heads, notably in thin layers Expired - Lifetime US5124869A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8805592 1988-04-27
FR8805592A FR2630853B1 (fr) 1988-04-27 1988-04-27 Dispositif matriciel a tetes magnetiques notamment en couches minces

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US5124869A true US5124869A (en) 1992-06-23

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Country Status (6)

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US (1) US5124869A (fr)
EP (2) EP0677838B1 (fr)
JP (1) JP2874893B2 (fr)
KR (1) KR0161963B1 (fr)
DE (2) DE68929246T2 (fr)
FR (1) FR2630853B1 (fr)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5394286A (en) * 1990-10-19 1995-02-28 Thomson Consumer Electronics Method for the addressing of elementary heads of a multipack head for recording on a magnetic medium, and magnetic head implementing said method
EP0747889A1 (fr) * 1995-06-06 1996-12-11 Thomson-Csf Tête d'enregistrement/lecture matricielle à structure zigzag
US5606474A (en) * 1995-01-17 1997-02-25 Latsu, Inc. High density disk drive with accelerated disk access
US5671106A (en) * 1994-11-25 1997-09-23 Thomson-Csf Matrix magnetic recording/reading head
US5745329A (en) * 1995-09-12 1998-04-28 Thomson-Csf Magnetic recording/reading head
US5771142A (en) * 1994-07-01 1998-06-23 Thomson-Csf Multitrack magnetic write/read head arrangement with integal multiple head gap widths
US5870361A (en) * 1994-12-23 1999-02-09 Thomson-Csf Device and system for reading recording media with cross-talk correction circuitry
US5883750A (en) * 1992-12-22 1999-03-16 Thomson-Csf Method and system for the magnetic recording of information elements and information medium by providing current correction for cross-talk magnetic flux
US5973890A (en) * 1994-07-26 1999-10-26 Thomson-Csf Magnetic head with saturable element between the poles outside of the gap
US6400521B1 (en) * 1995-09-21 2002-06-04 Deutsche Thomson-Brandt Gmbh Process for the recording of digital signals on a magnetic tape in multiple longitudinal tracks and magnetic-tape recording apparatus for carrying out the process
KR100335705B1 (ko) * 1993-11-09 2002-09-05 똥송-쎄 에스 에프 자기기록/판독헤드
US6449112B1 (en) * 1998-11-11 2002-09-10 Thomson Lincesing Sa Tape recorder having a driver circuit for a matrix head
US6650496B2 (en) 2001-05-15 2003-11-18 Phs Mems Fully integrated matrix magnetic recording head with independent control
US20040027964A1 (en) * 2000-10-17 2004-02-12 Jean-Claude Lehureau Medium for recording optically readable data, method for making same and optical system reproducing said data
US6778669B1 (en) 1998-11-24 2004-08-17 Thomson-Csf Quantum encryption device
US20040246487A1 (en) * 2001-05-15 2004-12-09 Jean-Claude Lehureau Optical fibre gyro
EP1498877A1 (fr) * 2003-07-15 2005-01-19 O-Mass AS Agencement de têtes d'écriture
US20050152066A1 (en) * 2004-01-08 2005-07-14 Imation Corp. System with matrix array of write heads and array of magnetoresistive (MR) read heads
US20050152067A1 (en) * 2004-01-08 2005-07-14 Yung Yip System with matrix array of write heads and matrix array of magnetoresistive (MR) read heads
US6958956B1 (en) 1999-08-10 2005-10-25 Thales Magneto-optical reading device for multi-track magnetic tapes
US20060061906A1 (en) * 1999-12-30 2006-03-23 Advanced Research Corporation Wear pads for timing-based surface film servo heads
US7130152B1 (en) 1999-04-01 2006-10-31 Storage Technology Corporation High track density magnetic recording head
US7948705B2 (en) 1999-12-30 2011-05-24 Advanced Research Corporation Method of making a multi-channel time based servo tape media
US8068301B2 (en) 2008-03-28 2011-11-29 Advanced Research Corporation Magnetic media formed by a thin film planar arbitrary gap pattern magnetic head
US8144424B2 (en) 2003-12-19 2012-03-27 Dugas Matthew P Timing-based servo verify head and magnetic media made therewith
US8416525B2 (en) 2004-05-04 2013-04-09 Advanced Research Corporation Magnetic media formatted with an intergrated thin film subgap subpole structure for arbitrary gap pattern magnetic recording head
US8767331B2 (en) 2009-07-31 2014-07-01 Advanced Research Corporation Erase drive system and methods of erasure for tape data cartridge

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FR2639137B1 (fr) * 1988-11-15 1990-12-21 Thomson Csf Tete magnetique a entrefer saturable et dispositif matriciel comportant un ensemble de telles tetes
FR2648940B1 (fr) * 1989-06-27 1991-09-06 Thomson Csf Procede de realisation de tete magnetique multipiste et tete magnetique multipiste
FR2699722B1 (fr) * 1992-12-22 1997-06-06 Thomson Csf Procede et systeme d'enregistrement magnetique d'informations et support d'informations.
FR2712418B1 (fr) * 1993-11-09 1995-12-22 Thomson Csf Procédés de réalisation collective de bobinages.
FR2723243B1 (fr) * 1994-07-26 1996-09-06 Thomson Csf Dispositif d'enregistrement et/ou de lecture de tetes magnetiques et son procede de realisation
FR2727589B1 (fr) * 1994-11-25 1997-01-03 Thomson Csf Dispositif et systeme de lecture
FR2727556B1 (fr) 1994-11-29 1997-01-03 Thomson Csf Procede de realisation d'une tete magnetique d'enregistrement/lecture et tete d'enregistrement/lecture
KR19990022271A (ko) * 1995-06-07 1999-03-25 도날드 엘. 웨이트 패터닝된 폴을 가지며 헤드표면이 평탄한 지형으로 된 박막헤드
FR2736783B1 (fr) * 1995-07-13 1997-08-14 Thomson Multimedia Sa Procede et appareil d'enregistrement et de lecture avec un support d'enregistrement de grande capacite
JP2007226921A (ja) 2006-02-27 2007-09-06 Sony Corp 磁気ヘッド装置および磁気記録再生装置

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US3309681A (en) * 1962-08-21 1967-03-14 Bunker Ramo Multi-apertured memory arrangement
US3492663A (en) * 1965-06-10 1970-01-27 Bell Telephone Labor Inc Thin magnetic film memory with isolated sense conductors
US3483538A (en) * 1965-07-17 1969-12-09 Telefunken Patent Data storage
US3662361A (en) * 1968-02-13 1972-05-09 Ibm Magnetic head with deposited core and signal conductor
US3947831A (en) * 1972-12-11 1976-03-30 Kokusai Denshin Denwa Kabushiki Kaisha Word arrangement matrix memory of high bit density having a magnetic flux keeper
US3881192A (en) * 1973-05-24 1975-04-29 Honeywell Inc Magnetic recorder and printed circuit recording head therefor
US4339760A (en) * 1979-11-05 1982-07-13 General Electric Company Magnetic printing head having a high signal-to-noise ratio
EP0097836B1 (fr) * 1982-06-30 1989-10-04 International Business Machines Corporation Appareil pour l'enregistrement magnétique
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Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5394286A (en) * 1990-10-19 1995-02-28 Thomson Consumer Electronics Method for the addressing of elementary heads of a multipack head for recording on a magnetic medium, and magnetic head implementing said method
US5883750A (en) * 1992-12-22 1999-03-16 Thomson-Csf Method and system for the magnetic recording of information elements and information medium by providing current correction for cross-talk magnetic flux
KR100335705B1 (ko) * 1993-11-09 2002-09-05 똥송-쎄 에스 에프 자기기록/판독헤드
US5771142A (en) * 1994-07-01 1998-06-23 Thomson-Csf Multitrack magnetic write/read head arrangement with integal multiple head gap widths
US5973890A (en) * 1994-07-26 1999-10-26 Thomson-Csf Magnetic head with saturable element between the poles outside of the gap
US5671106A (en) * 1994-11-25 1997-09-23 Thomson-Csf Matrix magnetic recording/reading head
US5870361A (en) * 1994-12-23 1999-02-09 Thomson-Csf Device and system for reading recording media with cross-talk correction circuitry
US5606474A (en) * 1995-01-17 1997-02-25 Latsu, Inc. High density disk drive with accelerated disk access
US5920448A (en) * 1995-06-06 1999-07-06 Thomson-Csf Matrix type recording/reading head with zigzag structure
FR2735269A1 (fr) * 1995-06-06 1996-12-13 Thomson Csf Tete d'enregistrement/lecture matricielle a structure zigzag
EP0747889A1 (fr) * 1995-06-06 1996-12-11 Thomson-Csf Tête d'enregistrement/lecture matricielle à structure zigzag
US5745329A (en) * 1995-09-12 1998-04-28 Thomson-Csf Magnetic recording/reading head
US6400521B1 (en) * 1995-09-21 2002-06-04 Deutsche Thomson-Brandt Gmbh Process for the recording of digital signals on a magnetic tape in multiple longitudinal tracks and magnetic-tape recording apparatus for carrying out the process
US6449112B1 (en) * 1998-11-11 2002-09-10 Thomson Lincesing Sa Tape recorder having a driver circuit for a matrix head
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DE68929246T2 (de) 2001-04-05
EP0340085A2 (fr) 1989-11-02
EP0677838B1 (fr) 2000-09-06
DE68925544T2 (de) 1996-08-08
KR0161963B1 (ko) 1998-12-15
DE68929246D1 (de) 2000-10-12
KR890016511A (ko) 1989-11-29
EP0340085A3 (fr) 1993-12-15
EP0340085B1 (fr) 1996-01-31
FR2630853A1 (fr) 1989-11-03
DE68925544D1 (de) 1996-03-14
EP0677838A3 (fr) 1996-05-22
JP2874893B2 (ja) 1999-03-24
EP0677838A2 (fr) 1995-10-18
JPH0242612A (ja) 1990-02-13
FR2630853B1 (fr) 1995-06-02

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